https://github.com/iyashwantsaini/kubernetes_master
Contains basics of Kubernetes
https://github.com/iyashwantsaini/kubernetes_master
docker kubernetes
Last synced: 3 months ago
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Contains basics of Kubernetes
- Host: GitHub
- URL: https://github.com/iyashwantsaini/kubernetes_master
- Owner: iyashwantsaini
- License: mit
- Created: 2020-08-23T19:30:30.000Z (almost 5 years ago)
- Default Branch: master
- Last Pushed: 2020-08-24T11:04:17.000Z (almost 5 years ago)
- Last Synced: 2025-01-16T22:29:40.127Z (5 months ago)
- Topics: docker, kubernetes
- Homepage:
- Size: 1.16 MB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# Kubernetes | k8s
- Helps in scaling application
- It's a system for running many diff containers on multiple diff machines
- Usage : when you need to run many diff conatiners with diff images
- VMS are called nodes
- nodes are individual vms that contain containers
- nodes are managed by master
- kube-proxy is connection to outside workd
- nodes
- pod
- runs containers that need to be in a same network
- nginx container
- label in pod | selector in service pairs -> used to setup forwarding/routing.
- these are like key value pairs used for connection.
- master keeps no of containers running in a node in check
- tells nodes to create certain copies of some container when required
- use declaritive approach not imperitive
- declaritive
- update config file
- upload config file
- all done automatically
- deployments
- can run multiple pods
- overcomes limitations of pods
- best for dev and prod purposes
- services
- help us to connect to different pods inside a deployment
- updation
- to update image add/tag version number to image while building
```
> docker build -t meyash/multi_workflow_client:v2 .
> docker push meyash/multi_workflow_client:v2
```
- use an imperitive method to then update your pods
```
> kubectl set image / =
> kubectl set image deployment/client-deployment client=meyash/multi_workflow_client:v2
```
- multiple dockers
- kubernetes also runs a docker inside our pods/developments
- so we have one local docker and one inside vm
- connect to docker in vm
```
> eval $(minikube docker-env)
> minikube docker-env
> docker ps
```
- in new terminal local will run only
## Phases
- dev : minikube
- > minikube start
- > minikube status
- > minikube stop
- > kubectl cluster-info
- kubectl : for interacting with it
- prod : managed solutions like in EKS(amazon), GKE(gcloud)
## yml conf-files
- these files create an object.
- StatefulSet
- ReplicaController
- Pod -> runs one or more closely related containers
- Services -> helps setup networking
- ClusterIP
- NodePort
- LoadBalancer
- Ingress
- kind : object type -> every object has specific container
- apiVersion : v1
- componentStatus
- configMap
- Endpoints
- Event
- Namespace
- Pod
## kubectl
- run these to run object instances
```
> kubectl apply -f client-pod.yaml
> kubectl apply -f client-node-port.yaml
```
- find status of various object instances created
```
> kubectl get pods
> kubectl get pods -o wide
> kubectl get services
```
- deleting various object instances
```
> kubectl delete pod client-pod
> kubectl delete service client-node-port
> kubectl delete -f config_name.yaml
```
- describe/investigate the object
```
> kubectl describe
> kubectl describe pod client-pod
```
- start deployment
```
> kubectl apply -f config_file.yaml
```
## minikube
- access our app
```
> minikube ip
Go to ip:/nodeport
```
- access dashboard (web interface)
```
> minikube dashboard
```